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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1845337	Day One Biopharmaceuticals Inc.	DAWN	Pharmaceutical Preparations (2834)	832415215

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1863676	C. Samuel Blackman	2000 Sierra Point Parkway, Suite 501 Brisbane CA 94005	Head Of Research And Developme	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2023-11-15	1,187	$0.00	1,237,506	No	4	M	Direct
Common Stock	Acquisiton	2023-11-15	1,437	$0.00	1,238,943	No	4	M	Direct
Common Stock	Disposition	2023-11-16	709	$11.69	1,238,234	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted Stock Units	Disposition	2023-11-15	1,187	$0.00	1,187	$0.00
Common Stock	Restricted Stock Units	Disposition	2023-11-15	1,437	$0.00	1,437	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
9,504			No	4	M	Direct
17,252			No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	1,000,000	Indirect	See Footnote

Footnotes

Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock upon settlement for no consideration.
The sale of shares is for the sole purpose of covering the Reporting Person's tax liability with respect to the settlement of RSUs.
The Reporting Person is the sole manager, and has shared voting and dispositive power with his wife as members. The Reporting Person continues to report beneficial ownership of all of the Issuer's Common Stock held by the 2021 Blackman Family LLC but disclaims beneficial ownership except to the extent of his and his wife's pecuniary interest therein.
The RSUs will vest as to 1/16th of the total award in quarterly installments on February 15, May 15, August 15 and November 15, subject to the Reporting Person's provision of service to the Issuer on each vesting date.